The Nestorian stone is reportedly located at the "Holy of Holies," Okunoin. I didn't see it, but then there are so many wonderful things there, and I have so much to learn!* Did you know that O-sensei had a "portrait" of Jesus among his Shinto paraphernalia? I had a picture of it once, included it in my masters thesis!

Allen
". . . we should not indulge in senseless speculation while clinging to the ordinary and superficial meanings of these words. The Existence consisting of the Six Great Elements, the essence of the World of Dharma, is free without any obstacle and is in a state of eternal harmony."